This I find kind of interesting because I have looked all over the place for it and could never find it in any kind of Glock information or manuals even those it seems quite fundamental to me.
I was actually look for replacement sights and used google to search "Glock replacement front sights"
This popped up several items down under "People also ask"....
"Are all Glock front sights the same
ALL models use the same 4.2mm fixed front sight. Glock sights their pistols nominally for 25 meter POI. OEM rear sight elevations of 6.1mm, 6.5mm, 6.9mm, and 7.3mm are available.. An old generic Glock thumb rule states that each increment taller raises the POI 50mm (2 inches) at 25 meters (27 yards)."
So, I guess you should expect new Glocks with factory settings to have a POI below the POA by as much as an inch and a half at 7 yards, with a .22 caliber Glock 44.
Now I have no information as to where this nominal 25 yard sighting comes from, but it's the first place I have ever seen that even gives a hint as to where guns are sighted